Mathematics
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    55x+150(30-x)<2600
    55x+150(30-x)<
    3x^2-10x-1>0
    10x>6×2
    2(x×2)-3x+1<0
    2x×2-3x+1<0
    x×2-11x+18>0
    -x×2-7x+8>0
    (-x×2)-7x+8>0
    -(x×2)-7x+8>0
    3x-x<0
    x+3/2 - 5x-1/6 x≦5
    x/2 -3x>10
    x/188+10>x/180
    X/188+10>x/180+8
    7-3x>0
    (2x+1)/3 - (3x+2)/2>1
    -9<-5/3*x<-2
    -(1/2)x≤0
    90<11y-2<100

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